On a sunny day, a tower casts a shadow 35.2m long. At the same time, a 1.3m parking meter that is nearby casts a shadow 1.8m long. How high is the tower to the nearest tenth of a metre?

Triangle formed by parking meter:

Triangle formed by tower (Total triangle):

*The value was obtained by adding and .

*The value was obtained by subtracting and from .

Therefore, the height of the tower is .

Textbook answer: .

Where did I make the mistake?